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Resolve "Redesign solver class"

Closes #6

See merge request !7

Use references over pointers

Gradient back to being a pointer type
Add additional template parameters for fields
Also update copyright

Add base class for electrostatics problems

Resolve "Add support for arbitrary operators"

Closes #3

See merge request !4

Solver operator now returns a type different from its argument
Use a wrapper to set the operator

Resolve "Add Poisson solver base class"

Closes #2

See merge request !2

Merge branch '2-add-poisson-solver-base-class' of gitlab.psi.ch:OPAL/Libraries/ippl-solvers into 2-add-poisson-solver-base-class

Resolve "Test"

Closes #1

See merge request OPAL/Libraries/ippl-solvers!1